SCIENCE GOALS - THE GOAL OF THIS PROJECT IS TO CONDUCT OBSERVATIONS OF SMALL BODIES THAT CAN BE USED TO TEST SOME OF THE CURRENT SOLAR SYSTEM DYNAMICS MODELS. METHODOLOGY PROPOSED - THE OLD VIEW OF COMET FORMATION SUGGESTS THAT THE LONG-PERIOD (LP) COMETS ARE ICE-RICH PLANETESIMALS THAT FORMED IN THE VICINITY OF THE GIANT PLANETS AND WERE SCATTERED OUT TO THE OORT CLOUD AS THEIR ORBITS WERE PERTURBED BY THE GIANT PLANETS. LATER ORBITAL PERTURBATIONS BY PASSING STARS INJECTED THEM INTO THE INNER SOLAR SYSTEM WHERE THEIR ICES BEGAN TO SUBLIME UNDER THE EFFECT OF SOLAR RADIATION. OUR PARADIGM OF PLANET FORMATION IS CHANGING WITH MODELS THAT DEMONSTRATE THAT THE GIANT PLANETS MIGRATED IN THE SOLAR SYSTEM REDISTRIBUTING PLANETESIMALS BOTH BRINGING ICY MATERIAL TO THE INNER SOLAR SYSTEM AND EJECTING INNER SOLAR SYSTEM MATERIAL OUTWARD. WE HAVE NEVER HAD SAMPLES OF PRIMITIVE BUILDING BLOCKS OF MATERIAL FROM THE EARTH-FEEDING ZONE. RECENT PANSTARRS 1 DISCOVERIES OF OBJECTS ON LONG-PERIOD COMET ORBITS THAT ARE MINIMALLY ACTIVE WHILE AT SMALL PERIHELIA HAVE SUGGESTED THE INTRIGUING POSSIBILITY THAT THESE COULD POTENTIALLY REPRESENT INNER SOLAR SYSTEM MATERIAL THAT WAS EJECTED INTO THE OUTER SOLAR SYSTEM DURING PLANET MIGRATION THAT IS NOW MAKING ITS WAY BACK IN. THE FIRST OBJECT DISCOVERED IN 2013 TURNED OUT TO HAVE A SPECTRUM REDDER THAN D-TYPE OBJECTS BUT EXHIBITED LOW-LEVEL ACTIVITY THROUGHOUT PERIHELION PASSAGE. THE SECOND ONE APPEARS TO HAVE AN S-TYPE ASTEROID SPECTRUM AND WAS LIKEWISE ACTIVE AT LOW LEVEL. NEITHER SPECTRAL TYPE HAS BEEN SEEN TO BE ACTIVE BEFORE. PAN-STARRS1 AND OTHER ALL-SKY SURVEYS ARE DISCOVERING OVER A DOZEN OF THESE OBJECTS PER YEAR. SCIENCE OBJECTIVE - WE PROPOSE TO CHARACTERIZE A SET OF MINIMALLY ACTIVE OBJECTS ON LONG-PERIOD COMET ORBITS TO UNDERSTAND THE DISTRIBUTION OF SMALL BODY SURFACE MATERIAL TYPES (E.G. C-CLASS D-CLASS S-CLASS). OUR SAMPLE INCLUDES BEING DISCOVERED BY ALLSKY SURVEYS AND ADDITIONALLY WE WILL SEARCH EXISTING ASTRONOMICAL IMAGE ARCHIVES FOR OTHER CANDIDATES. WE WILL OBTAIN SPECTRAL REFLECTIVITIES OF THEIR SURFACES AND DATA OVER A RANGE OF DISTANCES. THE HELIOCENTRIC LIGHT CURVES WILL BE USED TO MODEL THE AMOUNT AND TYPE OF VOLATILES. RELEVANCE TO THE SOLAR SYSTEM OBSERVATIONS PROGRAM - SMALL PRIMITIVE BODIES IN PARTICULAR COMETS WERE WITNESS TO THE SOLAR SYSTEM S FORMATIVE PROCESSES. NASA S CROSS-CUTTING THEMES FOR SOLAR SYSTEM EXPLORATION AND MISSIONS SEEK TO UNDERSTAND THE INITIAL STAGES AND CONDITIONS DURING FORMATION AND WHAT THE PRIMORDIAL SOURCES OF ORGANIC MATTER AND VOLATILES FOR PLANETARY HABITATS WERE. THIS PROGRAM IS AN OBSERVING PROGRAM THAT WILL BE DOING EXTENSIVE FOLLOW-UP OBSERVATIONAL FOLLOW-UP USING FACILITIES ON MAUNAKEA AND IN CHILE OF NEW OBJECTS ON LONG-PERIOD ORBITS THAT BEING DISCOVERED BY THE NASA-SPONSORED PANSTARRS SURVEY PROGRAM. SOME OF THESE OBJECTS ARE ALSO NEOS AND THESE REPRESENT A NEW CLASS OF PARTICULARLY HAZARDOUS OBJECTS BECAUSE THEIR LONG-PERIOD COMET ORBITS MEAN THEY TRAVERSE THE INNER SOLAR SYSTEM VERY QUICKLY BUT SECONDLY DUE TO THEIR INACTIVITY THEY WILL BE MUCH HARDER TO DETECT THAN TYPICAL LONG-PERIOD COMETS.
$757,667FY2020National Aeronautics and Space AdministrationNASA
University Of Hawaii, Honolulu